Optical apparatus, on-vehicle system including the same, and moving apparatus

Abstract

An optical apparatus includes a deflection unit configured to deflect illumination light from a light source to scan an object, and deflect reflected light from the object, and a light guide unit configured to guide the illumination light from the light source to the deflection unit and guide the reflected light from the deflection unit to a light receiving element. The light guide unit includes a first optical element to change a diameter of the illumination light from the light source, a second optical element including a passage region through which the illumination light from the first optical element passes and a reflective region to reflect the reflected light from the deflection unit, and at least one fixing member fixing the first optical element and the second optical element to each other.

What is claimed is: 
     
         1 . An optical apparatus comprising:
 a deflection unit configured to deflect illumination light from a light source to scan an object and deflect reflected light from the object; and   a light guide unit configured to guide the illumination light from the light source to the deflection unit and guide the reflected light from the deflection unit to a light receiving element,   wherein the light guide unit includes a first optical element to change a diameter of the illumination light from the light source, a second optical element including a passage region through which the illumination light from the first optical element passes and a reflective region to reflect the reflected light from the deflection unit, and at least one fixing member fixing the first optical element and the second optical element to each other.   
     
     
         2 . The optical apparatus according to  claim 1 , wherein the at least one fixing member fixes the first optical element and the second optical element to each other outside the passage region. 
     
     
         3 . The optical apparatus according to  claim 1 , wherein the at least one fixing member includes a first fixing member and a second fixing member, a coefficient of linear expansion of the first fixing member being different from a coefficient of linear expansion of the second fixing member. 
     
     
         4 . The optical apparatus according to  claim 1 , wherein the at least one fixing member is a bonding member bonding the first optical element and the second optical element to each other. 
     
     
         5 . The optical apparatus according to  claim 1 , wherein a following conditional expression is satisfied:
     t< 1.0 mm,   
       where t is a distance between the first optical element and the second optical element. 
     
     
         6 . The optical apparatus according to  claim 1 , wherein the first optical element includes a first surface on which the illumination light from the light source is incident, and a second surface from which the illumination light from the first surface exits toward the second optical element. 
     
     
         7 . The optical apparatus according to  claim 6 , wherein the illumination light from the first surface is incident on the second surface, the illumination light not travelling via any other surface. 
     
     
         8 . The optical apparatus according to  claim 6 , wherein, in a cross-section perpendicular to the first surface and the second surface, a diameter of the illumination light emitted from the second surface is larger than a diameter of the illumination light incident on the first surface. 
     
     
         9 . The optical apparatus according to  claim 6 , wherein the first optical element includes a third surface on which light reflected by at least one of the second surface or the passage region is incident. 
     
     
         10 . The optical apparatus according to  claim 9 , wherein the first surface reflects the light reflected by the at least one of the second surface or the passage region and then guides the light to the third surface. 
     
     
         11 . The optical apparatus according to  claim 6 , further comprising a light receiving unit for light source configured to receive the light reflected by at least one of the second surface or the passage region. 
     
     
         12 . The optical apparatus according to  claim 6 , wherein a following conditional expression is satisfied:
   −10<θ B −θ 1 <10,
   
       where θ 1  (degrees) is an angle of incidence of the illumination light with respect to the first surface, and θ B  (degrees) is a Brewster's angle for the first surface, in a cross-section perpendicular to the first surface and the second surface. 
     
     
         13 . The optical apparatus according to  claim 1 , wherein the reflective region is on an optical surface of the second optical element opposite to the first optical element. 
     
     
         14 . The optical apparatus according to  claim 1 , wherein the illumination light from the passage region enters the deflection unit, the illumination light not travelling via any other surface. 
     
     
         15 . The optical apparatus according to  claim 1 , further comprising a control unit configured to acquire distance information on the object based on an output of the light receiving element. 
     
     
         16 . An on-vehicle system comprising the optical apparatus according to  claim 1 , wherein a possibility of a collision between a vehicle and the object is determined based on distance information on the object obtained by the optical apparatus. 
     
     
         17 . The on-vehicle system according to  claim 16 , further comprising a control apparatus configured to output a control signal to generate a braking force in the vehicle in response to it being determined that there is a possibility of a collision between the vehicle and the object. 
     
     
         18 . The on-vehicle system according to  claim 16 , further comprising a warning apparatus configured to warn the driver of the vehicle in response to it being determined that there is a possibility of a collision between the vehicle and the object. 
     
     
         19 . The on-vehicle system according to  claim 16 , further comprising a notification apparatus configured to notify an outside of information about the collision between the vehicle and the object. 
     
     
         20 . A moving apparatus comprising the optical apparatus according to  claim 1 , wherein the moving apparatus is movable with the optical apparatus held on the moving apparatus.